Precious little has been written, comparatively, on international law, in comparison with other areas of law. Some believe that this is so because international law, technically, does not exist because there is no highest world court over all nations.

International law, however, in the Christian era before the 17th century derived from religious ethics.

In International Law Afloat on a Sea of Religious Ethics, Dr. George Gatgounis explores how religious ethics undergirded the early development of international law.